Dipper-trip for steam-shovels.



A, H: GEDDES. DIP PER TRIP FOR STEAM SHOVELS.

APPLIGATION FILED MAR. 9, 1911.

Patented A WITNESSES 02 40* By 37v .nnolzlvgrs UNITED STATES" Fam ornio "1 ALBERT H. GEDIJES, OF EMPIRE, CANAL ZONE.

DIPPER-TRI P FOR STEAM-SHOVELS.

Specification of Letters Patent.

Patented Aug. 8, 1911.

Application filed March 9, .1911. Serial No. 613,386;

To all whom it may concern:

Be it known that I, ALBERT H. Gnonns, a citizen of the United States, and a resident of Empire, Canal: Zone, have invented a new and Improved Dipper Trip for- Steam- Shovels, of which the following is a full, clear, and exact description.

This invention relates to dipper trips for steam shovels, dredges and the like, and has ueference more particularly to the combina- "tion in a steamshovel having a dipper, a

door therefor, and means for operating the dipper, of a latch for the door, a cylinder adapted to receive'a fluid under pressure, 'a

piston in the cylinder, a pivoted lever operatively connected with the piston, an.op-

erative connection between the lever and the *latch whereby the piston can be actuated to nection with steam shovels, dredges and like release the door, and a fixed stop arranged to limit the movement of the same.

The object of the invention is to provide a simple and eflicient dipper trip for use in concan 'be operated by steam or other fluid under pressure, and the operation of which is regulated by means of fixed stops which limit the movement of .the lever constituting anoperative connection between the fluid pressure operable mechanism and the latch of the dipper door.

The invention consists in the construction and combination of parts. to be'more fully described hereinafter and particularly se forth in the claims.

Reference is to be had to the--=accompany' ing drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures, and in which Figure 1 is a side elevation of a 'ste"am shovel having an embodiment of my in vention applied thereto; Fig. 2 is an enlarged side elevation of the end of the dlpper st ck or handle, showing in longitudinal sect on the cylinder; Fig. 3 is a longitudinal section on the. line 33 of- Fig.2; and Fig 4 s an inverted plan view of a dipper or bucket, showing the latch for locking the door.

Before proceeding to a more detailed explanation of my invention, it should be clearly understood that the same constitutes an improvement upon that form of the device disclosed in my United States Patent Number 978,57 5, dated December 13, 1910.

Certain of the" details of construction shown, for example herewith, form no part of the invention, and can be varied in accordance with individual preference and special conditions without departing from the underlying spirit of invention.

Referring more particularly to the drawings, I have shown a steam shovel of conven tional type having a car 10 carried upon wheeled trucks 11 and adapted torun upon tracks in the usual manner. The car carries a boiler 12 for producing steam to operate the shovel and is provided with a suitable engine (not shown) for this purpose At 1 one'end of the car is located the boom 13 mounted to swing andcarrying the'dipper stick or handle 14 in the customary manner.

An upright 15 is located at the end 0f thef car and is connected to the end of the boom by means of tie members 16. The dipper stick or handle is fashioned from two channels 17, arranged back to back and spaced apart, the channels being secured together in any suitable manner. The dipper stick is controlled by the bull wheel 18 and is arranged to move in the direction of its length. At the forward end it has a dipper stick casting 19 provided with upwardly-disposed extensions 20, provided with openings 21.

The dipper or bucket 22v has extensions.

23 pivotally connected with the extensions 20 Y by means of a hinge pin 2A which extends through the openings 21. Link members 25 are secured to the dipper and to the dipper stick. The bucket has at the open end the usual'bail 26 to which is connected the pulley block: 27. A cable. or chain 28 is attached to the pulley block and'passes over sheaves 29 to the operating engine (not shown), in

the usual manner. It will be understood th'at the engine actuates thechain to effect the operation-* of the bucket, and also serves ,to move the dipperstick and to move the boom. v r

A cylinder 30, open at one end and vided at the other with ahead 31 having a prois stufling box 32, is Provided with fianges33i secured 'by means of bolts 34% teens of the channels 17. Within the cylinder is a piston 35 having a piston rod 36 which passes through the stuffing box and has a flattened end 37. A lever 38 is pivotally mounted by means of a suitable-bolt pin 39, or the like to the dippeln'stick, and has its upper end.

pivotally connected by means of spaced links40'wit'h the flattened end 37 of the piston rod. At, the lower end the lever is provided with an openingel to which is attached a chain 42. The door 43' of the dipiper has hinge arms a4, by means of which it is pivotally associated with the hinge pin 24 and isthereby mounted to swing at the rear, end of the bucket and forms a closure therefor in its normal position. Upon the door is arranged a latch including a slidable bolt bar 45, the end of which, when inserted in the keeper d6 on the bucket, serves to hold thedoor closed. The bolt bar e5 1;. movably supported in oft-set brackets-47 and has an opening 48 at the end, 'which receives loosely a lever d9 pivotally mounted upon the bucketdoor. The chain 42 issecured at the end of the lever 19. By drawing upon the chainthe bolt bar is-retracted tb release the latch to permitthe door to swing open gravitationally, permitting the bucket to be emptied. At the op'en end the cylinder has a spider 50, and if so desired a spring canbe employed within the cylinder which tends to hold. the piston in normal position, but I prefer to dispense with this spring. The cylinder has a suitable inlet 51, at which the extremitypf the flexible tube 52 is con preferablywired, to prevent the rubber or other material being carried into the cylinder.

At each side of the lever 38, the dipper stick has a fixed stop :58, consisting preit'erably of-a bolt having a flat face adapted to be engaged by the lever. The bolts may be mounted upon. extensions 59 of the channel 1'4". The fined stops are so arranged that the movement of the lever is limited to prevent the piston from engaging directly. at the ends oi the cylinder, thus leaving a little clearance at all times.

After the bucket has been filled with material, and when it is desired'to empty it,

the three-Way valve, which .is normally closed, is opened to permit steam or other fluid under pressure to enter the cylinder and to move the piston toward the open end of thecylinden This pulls uponthe chain and operates the latch to withdraw the bolt bar, the door swings open and the contents of the bucket escape. When the door of the buclret is again closed the movement istransmitted through the chain and the lever to the piston, which is then returned to its normal position.

- Having thus described my invention, 1'

claim as new and desire to secure by Letters Patent;

1. In. a steam shovehthe combination with a dipper, a door therefor, and means for mechanipulating said dipper, of a latch for" the said door, a cylinder adapted to receive a fluid under pressure, a piston in said cyl inder,- a pivoted lever operatively connected a with-said piston, an operative connection between said lever and said latch, and a fixed stop for limiting the movement of said lever.

2. In a steam shovel, the combination with adinper, a door therefor,'means for operating said dipper, of a latch for-said door, a

cylinder adapted to receive a fluid under" resura'on's n r "s e, 1st in aid 11 de a iston rodconnected with said piston, a pivoted lever-operatively connectedwith said piston red, a flexible member operatively connect ing said lever and said latch, and a fixed. stop at each sideof said lever andservingto limit-the movementof the same.

In a steam shovel, the combination with a dipper stick, a' dipper carried. thereby, a door for said dippen meanstor. operating said dipper, of a latch. for-said door, acylindcr mounted upon said dipper stick and adapted toreceive a fiuid under pressure, a piston in said cylinder, a piston rod associated with said piston, a lever pivoted upon said dipper stick, a link connecting said piston and lever, and a flexible connection between said lever and said latch whereby said piston serves to release said door, and a fixed stopcarried by said dipper-stick at each side of said lever andserving' to limit the Y movement of the same whereby the travel. of said piston is less than the internal length arsenic n. ennnns.

Witnesses: GUY JOHANNES,

Wat. ROGERS. 

